Take a look at this site which displays cakes from all 50 states! This green one here is the one chosen to represent Texas, and was made by Romano's Bakery in Dallas.
I am surprised that of all the gorgeous intricate cakes out there that something so simple was chosen, but hey, it's still a pretty cake.
The site can be found here, and is fun to look through! http://www.people.com/people/gallery/0,,20041107_1,00.html